Peg-wood sharpener.



G. W. BOWERS.

PEG W091) SEAR ENER.

APPLIOATION FILED JAN. 22, 1909.

Patented Sept. 7, 1909.

6%272 eases ZL W a 5/ George ,lbawez a muxew. a. GRAHAM cu. FHOYO-LIFHDGRAPHERS. WASHINGTON n. a

snrrnn srnrns rnrnn orrroa GEORGE W. BOWERS, OF SOMERVILLE, MASSACHUSETT MENTS, TO HAIVIMEL, RIGLANIDER & C0,, NEW

NEW YORK.

PEGQWOOD SHARPENER.

Specification of Letters Patent.

Patented Sept. a, race.

Application filed January 22,1909. Serial No. 473,729.

To all whom it may concern:

Be it known that I, GEORGE W. Bowuns, of Somerville, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Peg-Wood Sharpeners, of which the following is a specification.

Watch and clock makers employ in the course of their drieal rod or stick of a special wood, known as peg wood, the stick being reduced at one end to a fine point which is adapted to enter small orifices, such as bearings in watch and clock parts to remove dust, oil, etc., therefrom.

The pointed end of a peg-wood stick requires a very slender or attenuated terminal portion adapted to act on all parts of a small hole or bearing, this end portion being best formed by imparting a longitudinally concave form to the cone formed by sharpening the stick.

Owing to the flexibility of the peg-wood, it has effectively form a pointed portion having a concave taper by ordinary appliances, such as are used in sharpening pencils, etc.

My invention has for its vide an effective sharpening device adapted to form a pointed end portion on a pegwood stick, such pointed portion having a concave taper, and having therefore an attenuated terminal of desirable length.

The invention consists in the improvements which I will now proceed to describe and claim.

Of the accompanying drawings, forming a part of this specificati0n,Figures l and 2 represent elevations showing different sides of a peg-wood sharpener embodying my invention. Fig. 3 represents a fragmentary sectional view showing the cutter and the rest, hereinafter referred to, and a pegwood stick in the position it occupies at the commencement of the sharpening operation. Fig. 4 re showing t e peg-wood stick at the comple tion of the sharpening operation. Fig. 5 represents a side view of the acting end portion of a sharpened peg-wood stick. Figs. 6 and 7 represent elevations of an attachment for watchmakers lathes, said attachment embodying the essential features of the invention.

in Figs. 1 and 2. and repairers work a cyl1n-.

been found diflicult to rapidly and obj ect to pro-.

resents a view similar to Fig. 3,

The same reference characters indicate they same parts in all the figures.

In the drawings, 12 represents a shaft Journaled in bearings in a suitable supporting frame, and adapted to be rotated by any suitable 1neans,such as a crank 13, as shown To the shaft 12 1s aliiXed a substantially circular cutter 1 1- Which is preferably formed by cutting tangential slots '15 in the periphery of a metal disk of suitable thickness, the outer side of each slot intersecting the periphery of the disk, and forming a knife having a shaving cutting edge 16, the said knife being slightly bent outwardly to raise the cutting edge above thefperiphery of the disk, thus giving each knife the requisite shaving cut and clearance.

17 represents a holder for the peg-wood stick 18 to be sharpened, said stick being of cylindrical form, a special wood being employed having qualities which adapt it for the cleaning of small holes, bearings, etc. The holder 17 is tubular, and has a frictional fit 011 the stick, the latter being movable endwise in the holder, and rotatable on its own axis. The stick may be fed forward by hand or by automatic means to present it to the cutter,and may be rotated either by hand or by the automatic rotation of the holder 17, said automatic rotation being effected by the means hereinafter described.

The relative arrangement of the cutter and the holder 17 is such that the axis of the stick is on a tangent with the periphery of the cutter, so that each of the cutting knives, moving in a circular path by the rotation of the cutter, is adapted to perform its part in forming a tapered end portion 18 (Fig. 5), the surface of which is longitudinally concave, and has an attenuated terminal portion 18 the taper of which is considerably less than that of the main body of the tapered end portion.

19 represents a fixed rest which in Figs. 1

and 2 is shown as secured by a screw 20 to an arm 21 forming a part of the supporting frame. The rest 19 has a segmental end face 22 which has the same curvature as the path in which the cutting knives move, and is opposed to the cutter so that it bears on one side of the tapered end portion 18 during the operation of forming the latter, as indicated in Figs. 3 and 4.

. The segmental end face 22 and the per- S, ASSIG-NOR, BY MfESNE ASSIGN- YORK, N. Y., A CORPORATION OF imeter of lthescutter collectively form tapered throat between which the end portion 18 ofthe stickis formed, the face 22. supporting. the said end portion along a .line 0-pposite the cutter, andin such manner as to prevent outward deflection of the stick-by the pressure of the cutter against it, the apex ornarrowend of saidthroatcoincidingswith the axis of 'the stick, andthe length of the segmental face 22 being such that it is endiportion' againstithle pressure ofthe'cutter, as indicated in Fig; 4.

At the: commencement ofthe operation of sharpeninga fresh sticle whichhas notbefore been sharpened, the I blunt. end: of. the stick-.ldea rs on the-supper: PlOI'tlOIYiOf. the segmental'face22-,1asshownin Fig. 3, the stickbei-ngzi supported continuously by. the segmental face 22xfrom'ithetbeginning to the end of the sharpeningzoperation, .as will be evidentzfrfona a-n inspectionzof Figs. 3 and I1 regard it as.- important that the segmental facea 22be arranged .to bear on the entire lengtlrof'theu tapered portion of the stick,-includingithe attenuated terminal 18 this-portion 'beingiparticirlarly. liable, on ac count! of its: flexibility to yield to the pressure: of the cu-ttervagainst it. The slightest yielding; ofJthe terminal. portion 1 while .it is being rotatedrin. contact withwthe cutter,

would prevent the-proper: formation of said terminal I portion:

The. rest; 19 mayrbe'adjustably secured to the frame! by. means of. a=slot 23 in the arm 21, said slotreceivingand permittingthei ad-I justrnent: of the: attaching; screw 20, .and .of the-rest 19.

The holder 17, as shown in.-F-ig.-;1, is-adapted to rotater in a: bearing. formed: for its receptiorrwin an arnr2ts forming, apart; of the supporting frame, and isprovided with a worm gear-25 which receives-a slow rotary motion from the: cutter shaft 12 through a spur gear 26- affixed-ito saidshaft, an: interinediate1shaftz27- ournaled in the supporting TIZLHIQQL': small spur gear or'pi'nion 28 affixed to r the shaft 27, and meshing with the gear 26, and a Worm -29 affixed to the shaft 27 and meshing with. the: worm gear 25.

The-device as-illustrated in Figs. 1T'and'2, is adapted forr hand ioperation. The cutter may-,hhowever, be rotated by' power:

In Figs. 6 and 7 I show my inventionembodied in an. attachment. adapted to :be appliedllto a:watchmaker?s-lathe, thebedBO of whichl is shown in 'rF-ig. 6. Said attachment includes -a-= frame composed "of two elongated siderportions 31,. 31, ...unitedat theirvlower:

ends byxone'orimore rivets -32,".andiseparated. at their upper: ends' by 'a: block .83 located be tween the separatedfupperiends: of? the sidepieces and 5': attached thereto by an screw' 34,

and, an arm 35 atfixed to-the bloc-ki33 andl having an eari" 36 on1=whichii 19 formed caztubulzir holder 37 for? the stick 18. The. shaft .12. carrying the cutter 14 is journaled in bearings 1n the separated upper ends of the side pieces 31.

The block serves not only as a support for the arm 35 andthe stick ghol-der 3'4, but also as a substitute for the rest 19, said block having asegmental face :38 which.corresponds in arraiigement and function with the segmental face 22 above described.

adapted to support all parts of the tapered The shaft 12 may be, in this embodiment of my invention, rotated-by powe-rapplied to itfrom the lathe, the pegqvood stick being fed and rotatedby hand.

I claim- 1. A peg-wood sharpener comprising a holder in whicha peg-wood stick is rotatable and longitudinally movable, a rotary cutter having one or more shaving'knivcs whiclrmove in a circularpath, so related to the holder as to form a longitudinally con-. cave pointed portion-on a stick which is axially rotated and moved endwise relatively to the cutter, and a rest having a.-

curved face-opposed to the perimeter of the cutter, said rest and cutter collectively forming convex sides of a tapering three. 1, the mqexofwhich coincides with the axis of the stick, the rest holding the said tapered portion-against the cutter and preventing the deflection of-said portion from the-axis of the stick.

2. A peg-wood sharpener comprising a rotary holder in which a stick is longitudinally' movable, a rotary cutter havingone or more shaving knives which move in a. circular path, a resthaving a curved face op posed to-th'e' perimeter of the cutter, and adapted to con'form to the curvature impartedby the cutter to the stick and hold the-end of the stick against the cutter during the sharpening operation, and mechanism for transmitting rotary motion from the cutter to the stock-holder.

A) peg-wood sharpener comprising a rotary. holder in which a peg-wood stick is longitudinally movable, a rotary cutter having one or more shaving knives which move inn circular. path, a rest. having a curved face opposedto the perimeter of the cutter, and adapted to: conform to the curvature impartedby'the cutter to the stick and hold the end of the stick against the cutter durinpt; the sharpeningoperation, a spur gear afiixed to the cutter, a worm gear aliiked to the stickholder and an intermediate shaft having a gear meshing with the spur gear,

.andia worm meshing with the worm gear.

In. testimony whereof Ihave allined my signature, in presence of two witnesses. 

